You're only going to gain 1mph top end from that. The thru hull does nothing other than give you better sound and free up space in the hull. In order to take advantage of the powerfilter you will need to get a Solas 14/19R prop. Then you will gain more. I also suggest picking up a Riva intake grate for your ski. Helps with hookup at higher speeds.

One thing I should also note with my testing is that I was always running too high of RPM, even when I had the 14/19R installed. With the Stage 1 I was always seeing 8150~8200 RPM which is too close to the limiter and above the sweet spot which is 8100 RPM. I probably could have gained another mph just by repitching the 14/19R and getting my RPM back down to 8100 RPM.

The 14/19R would work for a stage 2 once you repitch it, but you won't be getting the max performance out of your stage 2 with that prop. For a stage 2 setup you should run a 15/20R. However that is WAY TOO MUCH prop for a stage 1 setup and is sometimes too much prop for a stage 2. If you want the max performance out of each setup then you're going to need each prop for that particular setup and then pitch accordingly so your RPM are on the sweet spot. Check the classifieds section, someone probably has some good deals on 14/19R and 15/20R props.